CN203883811U - Analog-to-digital converting module of transformer station gas concentration detecting system - Google Patents
Analog-to-digital converting module of transformer station gas concentration detecting system Download PDFInfo
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- CN203883811U CN203883811U CN201420327850.8U CN201420327850U CN203883811U CN 203883811 U CN203883811 U CN 203883811U CN 201420327850 U CN201420327850 U CN 201420327850U CN 203883811 U CN203883811 U CN 203883811U
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Abstract
The utility model discloses an analog-to-digital converting module of a transformer station gas concentration detecting system. The analog-to-digital converting module comprises a voltage signal input wire, a voltage frequency converter, a frequency signal output wire, a first resistor, a second resistor, a fourth resistor, a first capacitor, and a second capacitor. The two ends of the first resistor are connected with the voltage signal input wire and the voltage frequency converter, respectively. The frequency signal output wire is connected with the voltage frequency converter. One end of the first capacitor is connected with a line between the first resistor and the voltage frequency converter. The other end of the first capacitor is connected with ground. The fourth resistor and the second capacitor are connected in parallel to form a parallel branch. One end of the parallel branch is connected with the voltage frequency converter. The other end of the parallel branch is connected with the second resistor. The other end of the second resistor is connected with ground. The analog-to-digital converting module is simple in overall structure and easy to produce. When the analog-to-digital converting module performs analog-to-digital conversion on a signal sensed by a sensor, converting precision can be guaranteed and the accuracy of transformer station gas concentration detection is further improved.
Description
Technical field
the utility model relates to substation safety protection field, the specifically analog-to-digital conversion module of transformer station's gas concentration detection system.
Background technology
Transformer station is for a long time in closed state, and in it, air, in first valve state, easily deposits the high gas of a large amount of molecular weight in transformer station, therefore, carries out regularly detecting particularly important to gas concentration in transformer station.In order to detect gas concentration in transformer station, design now a kind of transformer station gas concentration detection system, it comprises transducer, D.C. regulated power supply, analog to digital conversion circuit and digital display circuit, when this detection system application, be whole system power supply by D.C. regulated power supply, transducer converts the volumetric concentration signal detecting to voltage signal, and shows gas concentration value by digital display circuit after analog to digital conversion circuit conversion.Analog to digital conversion circuit in this transformer station's gas concentration detection system directly adopts analog to digital converter to realize, and when its application, precision is lower, and then can affect the accuracy of detection.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of analog-to-digital conversion module that can ensure transformer station's gas concentration detection system of conversion accuracy when sensor detection signal is converted to digital signal is provided.
The utility model addresses the above problem and is achieved through the following technical solutions: the analog-to-digital conversion module of transformer station's gas concentration detection system, comprise voltage signal input line, Voltage-to-frequency Converter, frequency signal output line, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the first adjustable resistance, the second adjustable resistance, the first electric capacity and the second electric capacity, described the first resistance two ends are connected with the 7th pin of voltage signal input line and Voltage-to-frequency Converter respectively, first electric capacity one end is connected on the circuit between the first resistance and Voltage-to-frequency Converter the 7th pin, its other end ground connection, described the 4th resistance and the second Capacitance parallel connection form parallel branch, this parallel branch one end is connected with the first pin and the 6th pin of Voltage-to-frequency Converter simultaneously, its other end is connected with the second resistance, the second resistance connects the other end ground connection of the parallel branch end of the 4th resistance and the second electric capacity formation relatively, described the 3rd resistance one end is connected on the connection line between the 4th resistance and parallel branch and second resistance of the second electric capacity formation, its other end is connected with the moving contact of the first adjustable resistance, first adjustable resistance one end connects power supply, its other end ground connection, described the 5th resistance two ends are connected with the second pin and second adjustable resistance of Voltage-to-frequency Converter respectively, and the second adjustable resistance connects the other end of the 5th resistance terminal and the equal ground connection of the 4th pin of voltage changer relatively, described the 6th resistance one end is connected with the 5th pin of voltage changer, the equal external power supply of the 8th pin of its other end and voltage changer, described frequency signal output line is connected with the three-prong of Voltage-to-frequency Converter.When the utility model application, the signal that transducer detects is inputted by voltage signal input line, input voltage frequency changer after the filter circuit filtering of the first resistance and the first electric capacity formation, voltage transitions is become pulse train by Voltage-to-frequency Converter, and then through frequency signal output line output linearity frequency signal.
Further, the analog-to-digital conversion module of transformer station's gas concentration detection system, also comprise the first transient voltage twin zener dioder, the connected node of the first electric capacity circuit between the first resistance and Voltage-to-frequency Converter is first node, first transient voltage twin zener dioder one end is connected on the circuit between first node and Voltage-to-frequency Converter the 7th pin, its other end ground connection.Wherein, the utility model when application the first transient voltage twin zener dioder can conducting over the ground within the utmost point short time, electrostatic interference can be introduced to ground, thereby can protect the utility model.
Further, the analog-to-digital conversion module of transformer station's gas concentration detection system, also comprises the 7th resistance, and described the 7th resistance one end is connected on frequency signal output line, its another termination power.
Further, the analog-to-digital conversion module of transformer station's gas concentration detection system, also comprises the 3rd electric capacity, and described the 3rd electric capacity one end is connected on the circuit between the 5th pin and the 6th resistance of voltage changer, its other end ground connection.
Further, described Voltage-to-frequency Converter adopts LM331 chip.
In sum, the utlity model has following beneficial effect: (1) the utility model overall structure is simple, be convenient to realize, cost is low, when the utility model application, signal transducer being detected by the first resistance and the first electric capacity carries out filtering, by Voltage-to-frequency Converter, voltage transitions is become to the train of impulses again, the instantaneous cycle of the pulse train that Voltage-to-frequency Converter generates is accurately proportional with analog quantity, because frequency available digital method is measured, can realize the conversion of mould/number, and the mode by the conversion using frequency as intermediate quantity can ensure conversion accuracy.
(2) the utility model is also provided with the second resistance and the second electric capacity, when the utility model application, under the effect of the second resistance and the second electric capacity, can produce an additional hysteresis effect, can improve the linearity.
Brief description of the drawings
Fig. 1 is the structural representation of a specific embodiment of the utility model.
In accompanying drawing, the corresponding name of Reference numeral is called: 1, voltage signal input line, 2, frequency signal output line, R1, the first resistance, R2, the second resistance, R3, the 3rd resistance, R4, the 4th resistance, R5, the 5th resistance, R6, the 6th resistance, R7, the 7th resistance, RW1, the first adjustable resistance, RW2, the second adjustable resistance, C1, the first electric capacity, C2, the second electric capacity, C3, the 3rd electric capacity, D1, the first transient voltage twin zener dioder.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is done to detailed description further, but execution mode of the present utility model is not limited to this.
Embodiment 1:
As shown in Figure 1, the analog-to-digital conversion module of transformer station's gas concentration detection system, comprises voltage signal input line 1, Voltage-to-frequency Converter, frequency signal output line 2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first adjustable resistance RW1, the second adjustable resistance RW2, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3.The Voltage-to-frequency Converter of the present embodiment adopts LM331 chip, wherein, LM331 chip is single supply work, supply voltage scope is 4.5～20V, it has, and temperature stability is good, noise inhibiting ability strong, data transmission is convenient, range regulates the characteristics such as simple, linearity error is little, low in energy consumption, LM331 chip has 8 pins, and its first pin is Iout pin, and this pin is an inner precision current source output terminal; The second pin is Is pin, and this pin is reference current output; Three-prong is Fout pin, and this pin is pulse frequency output; The 4th pin is GND pin, and this pin is ground pin; The 5th pin is R/C pin, and this pin is external timing resistance and timing capacitor end; The 6th pin is Vt pin, and this pin is threshold voltage input; The 7th pin is Vin pin, and this pin is the external voltage input being converted; The 8th pin is Vcc pin, the external 15V power supply of this pin.
First resistance R 1 two ends of the present embodiment are connected with the 7th pin of voltage signal input line 1 and Voltage-to-frequency Converter respectively, frequency signal output line 2 is connected with the three-prong of Voltage-to-frequency Converter, first capacitor C 1 one end is connected on the circuit between the first resistance R 1 and Voltage-to-frequency Converter the 7th pin, its other end ground connection, the 7th resistance R 7 one end are connected on frequency signal output line 2, its another termination 15V power supply.The 4th resistance R 4 and the second capacitor C 2 formation parallel branch in parallel, this parallel branch one end is connected with the first pin and the 6th pin of Voltage-to-frequency Converter simultaneously, its other end is connected with the second resistance R 2, the other end ground connection of the parallel branch end that the second resistance R 2 relative connection the 4th resistance R 4 and the second capacitor C 2 form, the 3rd resistance R 3 one end are connected on the connection line between parallel branch and the second resistance R 2 that the 4th resistance R 4 and the second capacitor C 2 form, its other end is connected with the first adjustable resistance RW1 moving contact, first adjustable resistance RW1 one end connects 15V power supply, its other end ground connection.The 5th resistance R 5 two ends are connected with the second pin and the second adjustable resistance RW2 of Voltage-to-frequency Converter respectively, and the second adjustable resistance RW2 connects the other end of the 5th resistance R 5 ends and the equal ground connection of the 4th pin of voltage changer relatively.The 6th resistance R 6 one end are connected with the 5th pin of voltage changer, the external 15V power supply of its other end, and the 3rd capacitor C 3 one end are connected on the circuit between the 5th pin and the 6th resistance R 6 of voltage changer, its other end ground connection.
In the present embodiment, the resistance of the first resistance R 1 is 100K Ω, the resistance of the second resistance R 2 is 47 K Ω, the resistance of the 3rd resistance R 3 is 22 K Ω, the resistance of the 4th resistance R 4 is 150 K Ω, the resistance of the 5th resistance R 5 is 308 K Ω, the resistance of the 6th resistance R 6 is 6.8 K Ω, the resistance of the 7th resistance R 7 is 10 K Ω, the resistance adjustable extent of the first adjustable resistance RW1 is 0～47 K Ω, the resistance adjustable extent of the second adjustable resistance RW2 is 0～10 K Ω, and the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3 threes' capacitance is 0.1 μ F.
In the present embodiment, the first resistance R 1 and the first capacitor C 1 form input filter link, ripple in filtering input signal, the first adjustable resistance RW1 is as zero potentiometer, and the second adjustable resistance RW2 is that conversion gain regulates, the second capacitor C 2 and the second resistance R 2 produce hysteresis effect, improve the linearity.The signal that when the present embodiment application, transducer detects is inputted by voltage signal input line 1, after Voltage-to-frequency Converter is processed, is exported by frequency signal output line 2 again.
Embodiment 2:
The present embodiment has been made following further restriction on the basis of embodiment 1: the present embodiment also comprises the first transient voltage twin zener dioder D1, the connected node of the first capacitor C 1 circuit between the first resistance R 1 and Voltage-to-frequency Converter is first node, first transient voltage twin zener dioder D1 one end is connected on the circuit between first node and Voltage-to-frequency Converter the 7th pin, its other end ground connection.In the present embodiment when application,, the first transient voltage twin zener dioder D1 can conducting over the ground within the utmost point short time, thereby reaches the object of electrostatic interference being introduced to ground, and then makes the present embodiment have the ability that absorbs electrostatic pulse, can avoid the components and parts of the present embodiment to damage.
As mentioned above, can realize preferably the utility model.
Claims (5)
1. the analog-to-digital conversion module of transformer station's gas concentration detection system, it is characterized in that, comprise voltage signal input line (1), Voltage-to-frequency Converter, frequency signal output line (2), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the first adjustable resistance (RW1), the second adjustable resistance (RW2), the first electric capacity (C1) and the second electric capacity (C2), described the first resistance (R1) two ends are connected with the 7th pin of voltage signal input line (1) and Voltage-to-frequency Converter respectively, the first electric capacity (C1) one end is connected on the circuit between the first resistance (R1) and Voltage-to-frequency Converter the 7th pin, its other end ground connection, described the 4th resistance (R4) and the second electric capacity (C2) formation in parallel parallel branch, this parallel branch one end is connected with the first pin and the 6th pin of Voltage-to-frequency Converter simultaneously, its other end is connected with the second resistance (R2), the second resistance (R2) connects the other end ground connection of the parallel branch end of the 4th resistance (R4) and the second electric capacity (C2) formation relatively, described the 3rd resistance (R3) one end is connected on the connection line between the 4th resistance (R4) and parallel branch and second resistance (R2) of the second electric capacity (C2) formation, its other end is connected with the moving contact of the first adjustable resistance (RW1), the first adjustable resistance (RW1) one end connects power supply, its other end ground connection, described the 5th resistance (R5) two ends are connected with the second pin and second adjustable resistance (RW2) of Voltage-to-frequency Converter respectively, and the second adjustable resistance (RW2) connects the other end of the 5th resistance (R5) end and the equal ground connection of the 4th pin of voltage changer relatively, described the 6th resistance (R6) one end is connected with the 5th pin of voltage changer, the equal external power supply of the 8th pin of its other end and voltage changer, described frequency signal output line (2) is connected with the three-prong of Voltage-to-frequency Converter.
2. the analog-to-digital conversion module of transformer station according to claim 1 gas concentration detection system, it is characterized in that, also comprise the first transient voltage twin zener dioder (D1), the connected node of the first electric capacity (C1) circuit between the first resistance (R1) and Voltage-to-frequency Converter is first node, first transient voltage twin zener dioder (D1) one end is connected on the circuit between first node and Voltage-to-frequency Converter the 7th pin, its other end ground connection.
3. the analog-to-digital conversion module of transformer station according to claim 1 gas concentration detection system, is characterized in that, also comprises the 7th resistance (R7), and it is upper that described the 7th resistance (R7) one end is connected to frequency signal output line (2), its another termination power.
4. the analog-to-digital conversion module of transformer station according to claim 1 gas concentration detection system, it is characterized in that, also comprise the 3rd electric capacity (C3), described the 3rd electric capacity (C3) one end is connected on the circuit between the 5th pin and the 6th resistance (R6) of voltage changer, its other end ground connection.
5. according to the analog-to-digital conversion module of the transformer station's gas concentration detection system described in any one in claim 1～4, it is characterized in that, described Voltage-to-frequency Converter adopts LM331 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420327850.8U CN203883811U (en) | 2014-06-19 | 2014-06-19 | Analog-to-digital converting module of transformer station gas concentration detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420327850.8U CN203883811U (en) | 2014-06-19 | 2014-06-19 | Analog-to-digital converting module of transformer station gas concentration detecting system |
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| CN203883811U true CN203883811U (en) | 2014-10-15 |
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| CN201420327850.8U Expired - Lifetime CN203883811U (en) | 2014-06-19 | 2014-06-19 | Analog-to-digital converting module of transformer station gas concentration detecting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038229A (en) * | 2014-06-19 | 2014-09-10 | 国网四川省电力公司成都市新都供电分公司 | Analog-digital conversion module of gas-concentration detecting system of transformer substation |
-
2014
- 2014-06-19 CN CN201420327850.8U patent/CN203883811U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038229A (en) * | 2014-06-19 | 2014-09-10 | 国网四川省电力公司成都市新都供电分公司 | Analog-digital conversion module of gas-concentration detecting system of transformer substation |
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